Hi @arslan786,
Michal from WalkABit team here. Our model is quite simple, currently we invest our own funds into user rewards, but we're in the partnership forming process with couple of cryptocurrencies, from which we will get the assets for giveaways to grow their usage in the market. On the other hand we also pay 5% and more cashback (depending on the location) on all offline transactions in our partner network. You get 5% and we get 5% fee which is covering the costs of running the platform and free giveaways for visiting landmarks.
Happy treasure hunting! :)

Michal